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    SubjectRe: How to find all the tasks with a Sys V shm?
    On Tue, 7 Mar 2006, Kamran Karimi wrote:
    > id = ipc_findkey(&shm_ids, key);
    > shp = shm_lock(id);
    > ...
    > But here we only get the vma of the task that created the shm, and not any
    > other task who has attached it.
    > How can we find all the vma structures that represent a shm?

    The simplest example to follow would be reset_vma_truncate_counts() in
    mm/memory.c: shp->shm_file->f_mapping gives you the struct address_space *
    mapping to pass to vma_prio_tree_foreach(). Ignore the i_mmap_nonlinear
    lines, you can't get nonlinear shm (because shm_vm_ops lacks .populate).
    You'll need to spin_lock(&mapping->i_mmap_lock) first, spin_unlock after.

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